A   

B   

C   

Fig. 1: Comparative histology of bronchiolitis obliterans: (A) normal airway; (B) classic form of disease with intraluminal polyp; (C) peribronchiolar form with clear lumen. In classic bronchiolitis obliterans the inflammatory process involves mainly the submucosal vessels. In the peribronchiolar form it involves primarily the vessels in the outer wall. All photos are by the author.

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